The Mississauga Tomahawks were a Junior "A" box lacrosse team from Mississauga, Ontario, Canada. The Tomahawks played in the OLA Junior A Lacrosse League. Some former Tomahawks players who have gone on to professional lacrosse are John Tavares, Peter Tavares, Anthony Cosmo, Jeff Shatler, Drew Candy, Jamie McKeracher, Cory Leigh, John Rosa, Rob Kirkby, Ted Dowling, Mat Giles, Jason Clark, Neil Doddridge and Ted Dowling.

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On June 26, 2014 the Board of Governors and the OLA Board of Directors approved the relocation of the Jr. A Tomahawks to Mimico, beginning in 2015. This is a franchise amalgamation between the Jr. A Tomahawks and the Jr. B Mountaineers. The Jr. B Tomahawks remained the direct affiliate of the Jr. A Mountaineers until the Tomahawk program was terminated following the 2014 season.